Paper Info
Title
Robust Beamforming Design For Covert Communications
Abstract
In this paper, we consider a common unicast beamforming network where Alice utilizes the communication to Carol as a cover and covertly transmits a message to Bob without being recognized by Willie. We investigate the beamformer design of Alice to maximize the covert rate to Bob when Alice has either perfect or imperfect knowledge about Willie's channel state information (WCSI). For the perfect WCSI case, the problem is formulated under the perfect covert constraint, and we develop a covert beamformer by applying semidefinite relaxation and the bisection method. Then, to reduce the computational complexity, we further propose a zero-forcing beamformer design with a single iteration processing. For the case of the imperfect WCSI, the robust beamformer is developed based on a relaxation and restriction approach by utilizing the property of Kullback-Leibler divergence. Furthermore, we derive the optimal decision threshold of Willie, and analyze the false alarm and the missed detection probabilities in this case. Finally, the performance of the proposed beamformer designs is evaluated through numerical experiments.
Year
DOI
Venue
2021
10.1109/TIFS.2021.3071602
IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
Keywords
DocType
Volume
Receivers, Wireless communication, Quality of service, Control engineering, Array signal processing, Technological innovation, Resource management, Covert communications, covert beamformer design, zero-forcing beamformer design, robust beamformer design
Journal
16
ISSN
Citations 
PageRank 
1556-6013
0
0.34
References 
Authors
0
7
Name
Order
Citations
PageRank
Shuai Ma152.12
Yunqi Zhang200.68
H. Li33710.75
Songtao Lu48419.52
Naofal Al-Dhahir52755319.65
Sha Zhang6123.13
Li Shiyin72313.56